页岩储层脆性指数的随钻测井计算方法研究——以威远地区寒武系筇竹寺组为例  

Research on calculation method of BI by logging while drilling of shale reservoirs: A case of Qiongzhusi formation in Cambrian, Weiyuan area

作　　者：王瀚玮 夏宏泉[1] 刘畅 赵昊 Wang Hanwei;Xia Hongquan;Liu Chang;Zhao Hao(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Sichuan Changning Gas Development Co.,Ltd,Chengdu,Sichuan 610000,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石油四川长宁天然气开发有限责任公司,四川成都610000

出　　处：《油气藏评价与开发》2018年第3期73-78,共6页Petroleum Reservoir Evaluation and Development

基　　金：国家重点基础研究发展计划(973计划)"页岩气水平井钻完井关键基础研究"(2013CB228003)

摘　　要：脆性指数作为岩石力学评价的一个新参数对储层后期压裂改造有着重要影响,将传统计算脆性指数的方法应用于页岩气水平井的地质导向钻井中,局限性较大。针对随钻测井曲线实时计算页岩脆性指数的问题,首先开展脆性指数和孔隙度的实验测试研究,为利用孔隙度测井信息计算脆性指数提供实验依据;其次采用统计回归法分析了声波时差、密度、中子、伽马测井值与脆性指数的相关性,构建利用单条随钻测井曲线计算脆性指数的计算方法,通过不同测井曲线对脆性指数的贡献率建立了页岩储层脆性指数的随钻计算模型;最后结合实例对该模型进行可行性分析。研究表明,该模型效果好且适用性强,为利用脆性指数进行页岩气水平井的地质导向钻井提供了可靠依据。As a new parameter of the rock mechanics evaluation, the brittleness index（BI）has an important influence on the later fracturing and reconstruction of the reservoirs. The traditional calculation methods of the BI applied to the geosteering drilling of the shale gas horizontal wells have many limitations. Aiming at the calculation of the BI in real time by the LWD curves, we started with the experimental study on the BI and porosity to provide an experimental basis for calculating the BI by the porosity log information. Then, we used the regression method to analyze the relevance of the AC, DEN, CNL, GR logging values and BI, calculated the BI by using single LWD curves, and through the contribution of different logging curves to the BI, established a BI calculation method by logging while drilling of the shale reservoirs. Finally, we analyzed the feasibility of the model by the examples. The research result shows that the model is effective and adaptable, which provides a reliable basis for the geosteering drilling of the horizontal wells of the shale gas by the BI.

关 键 词：脆性指数 页岩气水平井 随钻测井 测井曲线 地质导向 

分 类 号：TE311[石油与天然气工程—油气田开发工程]